Thread: Problem with reading in file...

Hi, I'm making a program for my CS1 class that will read in comic book names from a file, put them in a linked list, sort them, and then print them in a specific order. The problem I'm having right now is that when I run the program and type in the filename a runtime error occurs that pops up and asks me if I want to run Visual C++. I know where the problem is in my code but I don't know how to fix it. I marked where the problem is in my code below:

Code:

#include<stdio.h>
#include<math.h>
#include<stdlib.h>

struct comic
{
       char title[100];
       char issue[100];
       int issuenum;
       struct comic *next;
};

void assign(struct comic *comics, char title[100], char issue[100], int issuenum);

main()
{
      char filename[50], title[100], issue[100];
      char uscore = '_';
      char blank = ' ';
      int issuenum, numcomics, count = 0, cnt = 0;
      struct comic *thecomics;
      FILE *f1;
      
      printf("--------------------------------------------------------------------------------------");
      printf("Welcome to the comic book sorter!\n");
      printf("Please enter in the name of the file containing the comic books: ");
      
      //PROBLEM IS SOMEWHERE RIGHT IN HERE
      fflush(stdin);
      gets(filename);
      
       //Opens the file
       f1 = fopen(filename, "r");
       fflush(stdin);
       
       if(f1 != NULL)
       {
             fscanf(f1, "%d", numcomics);
             system("pause");
             
             do
             {
                    fscanf(f1, "%s %d %s", &title, &issuenum, &issue);
                    cnt = 0;
                    //Checks for the _ in the string and replaces it with a "space"
                    do
                    {
                         if(title[cnt] == uscore)
                         {
                                 title[cnt] = blank;
                         }
                         cnt++;
                    }while(cnt < 100);
                               
                    //Checks for the _ in the string and replaces it with a "space"
                    cnt = 0;
                    do
                    {
                         if(issue[cnt] == uscore)
                         {
                                 issue[cnt] = blank;
                         }
                         cnt++;
                    }while(cnt < 100);
                    
                    assign(thecomics, title, issue, issuenum);
                    
                    count++;
             }while(count < numcomics);
       }//Close if
       else
       {
           printf("There is nothing in the file!");
       }//Close Else
}//Close main

void assign(struct comic *comics, char title[100], char issue[100], int issuenum)
{
     struct comic *count = comics;
     struct comic *start = (struct comic*)malloc(sizeof(struct comic));
     
     strcpy(start->title, title);
     strcpy(start->issue, issue);
     start->issuenum = issuenum;
     start->next = NULL;
     
     while(count->next != NULL)
     {
          count = count->next;
     }
     
     if(count == NULL)
     {
          count = start;
     }
     else
     {
         count->next = start;
     }
}

Anyone know whats going on?

Don't fflush stdin. There is a FAQ here that you should read. Run a search.